| 摘要 |
PURPOSE:To simplify the constitution of a video signal switch, by using a comparator which receives a code showing the selection of a switch of the 1st switch circuit among the outputs of a holding circuit, compares the code with another code corresponding to a prescribed switch and gives the switch control to the 2nd switch circuit in accordance with the result of comparison. CONSTITUTION:The switch information (i) of a binary code is held at a holding circuit 1 with the timing of the trigger signal. A code i1 having the switch information of a switch circuit 2 containing plural cross points among the held signals is supplied to a decoder circuit 3 and converted into switch signals S corresponding to plural cross points in the circuit 2 to be sent to the circuit 2. On the other hand, a code i2 showing the selection of switches 7, 8 and 9 among the held outputs is supplied to a comparator 4 to be compared with the prescribed codes corresponding to the switches 7, 8 and 9 and produced at a code generating circuit 5. Then the cross point of a switch circuit 6 is closed by the output of a coincidence signal. Thus the function of the circuit 3 can be set equal among all switches. |
